If you want, the category boxes are as follows:
Composition Category
Genre
Mood
Instrument
Tempo
Keyword
Track Title
Composer
That last one took me a good 10 minutes on its own to figure out. I'm not big on kanji, but luckily for me most of them were within the realm of music, and were very easy to find. I made sure to take notes.
Composer is spelled 作曲家 or (Sakkyokuka)
Instrument is spelled 楽器 or (Gakki)
Tune or Composition is spelled 楽曲 or (Gakkyoku)
You will notice that most of these are spelled using 楽 and 曲
楽 is essentially the kanji for pleasure, but is also mostly used for music purposes. It's Japanese reading or (Kun'yomi) is Tanoshii meaning Fun. Its Chinese meaning (On'yomi) is Gaku, which is where its musical connotations exist. In fact if you were to spell 音樂 you would have Ongaku, which is the Japanese word for music.
曲 is also frequently used on the site, and has an On'yomi of Kyoku. That however is a very weird definition for me to grasp, apparently it's more of a compound that goes together with other kanji to actually form a word, but seems to signify a body of something. Generally when it's used with other music kanji, it signifies a composition, or body of music.
And just for kicks, the On'yomi for 器 is Ki, which is generally used for utensils or vessels. That explains the usage in the word 楽器 (Instrument)
I'll try explaining Sakkyokuka. Essentially it sounds like "Having a profession to make tunes," where 作 is "to make," 曲 is "tune," and 家 is used as a compound to signify a profession. Example: 音楽家 or Ongakka means musician. Thusly, Sakkyokuka is a Composer.
That's your Japanese lesson for today. I think that's about all you will need to know about the site. Let me know if there's something else you will need translated. I'm only good for Japanese though.